What do hobbies have according to the speaker? Undoubtedly hobbies have______.

Do you have your own hobbies? Do you keep in touch with people through your common hobbies?(16)There is no doubt that hobbies have many advantages.(17)Hobbies offer pleasure and help people relax after a busy day’s work or study: they also say things about a person. By asking about and knowing one’s hobbies, we can gain certain insight into the person’s personality or character.(18)Someone who goes hunting during weekends may be more energetic: someone who prefers reading or writing may be more of a quiet and silent type.(19)Nowadays a lot of clubs and websites are available for those who share the same hobbies.(20)For example a football fan can always join a club or access a website to communicate with other fans.